• Journal of Multimedia Information System
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• 제9권3호
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• pp.227-232
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• 2022

Disasters are now becoming commonplace and especially the vulnerable group such as the disabled, the elderly, children and foreigners are in a state of overlapping disasters. In this situation, ATSC 3.0-based UHDTV disaster information service for the visually and hearing impaired has been developing. This study focuses on the demand data collected through in-depth interview with the impaired. The demand analysis data is very important to development process of technology. The results of the interview show that it is essential to link the UHDTV disaster signals with home-network, IoT, wearable devices, and various assistive devices for the impaired (hearing aid, smart light bulbs, warning light, etc.). In outdoor space, UHDTV disaster information must be connected to public display media, digital signage, kiosk, screens in bus or taxi. If communication aids for the visually and hearing impaired are equipped with a function that can transmit and receive disaster information, it will help to minimize disaster damage.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1996년도 추계학술대회
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• pp.68-69
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• 1996

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.63-66
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• 1997

With the advent of high speed digital signal processing chips, new digital techniques have been introduced to the hearing instrument. This advanced hearing instrument circuitry has led to the need or and the development of new fitting approach. A number of different fitting approaches have been developed over the past few years, yet there has been little agreement on which approach is the "best" or most appropriate to use. However, when we develop not only new hearing aid, but also its fitting method, the intensive subject-based clinical tests are necessarily accompanied. In this paper, we present an objective method to evaluate and predict the performance of hearing aids without the help of such subject-based tests. In the hearing impairment simulation (HIS) algorithm, a sensorineural hearing impairment model is established from auditory test data of the impaired subject being simulated. Also, in the hearing impairment simulation system the abnormal loudness relationships created by recruitment was transposed to the normal dynamic span of hearing. The nonlinear behavior of the loudness recruitment is defined using hearing loss unctions generated from the measurements. The recruitment simulation is validated by an experiment with two impaired listeners, who compared processed speech in the normal ear with unprocessed speech in the impaired ear. To assess the performance, the HIS algorithm was implemented in real-time using a floating-point DSP.

• 대한방사선기술학회지:방사선기술과학
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• 제40권1호
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• pp.121-126
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• 2017

의료용 디지털 영상 및 통신 표준 영상과 3차원 프린팅을 이용한 보청기 이어 쉘 제작기술을 연구하였다. 이는 기존에 없는 새로운 적용방법이며 보청기 수요자의 안전, 감염, 제작시간, 진행 단계를 줄일 수 있는 적용기술이다. 연구는 의료용 디지털 영상 및 통신 표준 영상으로 스테레오리소그래피 파일을 만들기 위한 0.5 mm, 1.0 mm, 2.0 mm의 볼륨으로 획득한 값을 3차원 프린터로 출력 전과 후의 과정에서 형상표면에 미치는 영향을 실험하였다. 출력 전에는 스테레오리소그래피 파일구조에 대해 상대적 관계를 비교하였고, 출력 후에는 이어 쉘 형상표면의 적층구조 간격을 현미경으로 확대하여 비교하였다. 스테레오리소그래피 파일구조 분석에서 0.5 mm, 1.0 mm, 2.0 mm의 순으로 삼각형 꼭지점, 5개 이상의 교차점, 최대 교차점의 개수가 많았으며 외이도 형상 자체의 굴곡도에 따라 Bending, Angle, Crest 영역 순으로 삼각형 구조가 조밀하게 분포하였다. 디지털 현미경에 의한 이어 쉘 형상표면은 2.0 mm, 1.0 mm, 0.5 mm 순으로 적층구조 간격이 두껍게 나타났다. 이와 같이 스테레오리소그래피 표면구조는 3차원 이어 쉘 형상의 굴곡도가 불규칙하고 스테레오리소그래피 파일을 만들기 위한 의료용 디지털 영상 및 통신 표준 데이터의 볼륨 값이 작을수록 교차하는 스테레오리소그래피 삼각형 구조는 조밀함을 알 수 있었다.

• 전기전자학회논문지
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• 제14권1호
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• pp.47-54
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• 2010

본 연구에서는 잡음환경에서 디지털 보청기의 잡음제거를 위해 2,3,4,5개의 마이크로폰을 이용해 잡음제거를 하고 비교 분석 하였다. 실제 디지털 보청기에서 사용할 수 있게 하기 위해 귀걸이형 (behind-the-ear type, BTE) 보청기의 형태와 유사하게 마이크로폰을 배열한 실험 세트를 구성하여 각각의 조건에 따라 신호녹음을 하였고, 녹음된 각각의 신호들을 멀티 마이크로폰을 이용한 잡음제거 알고리즘으로 잡음 제거하였다. 평가 방법에 따라 잡음제거 전과 후의 SNR (Signal to Noise Ratio)과 PESQ (Perceptual Evaluation of Speech ) 측정 분석 결과 마이크로폰 3개와 4개를 사용하였을 때 가장 높은 성능 향상을 보였으며 대부분의 경우에서 마이크로폰의 개수가 늘어남에 따라 성능이 향상된 것을 확인하였다.

• 전자공학회논문지
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• 제49권12호
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• pp.219-225
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• 2012

디지털 보청기용 저전력, 저잡음 전치증폭기를 설계하였다. 본 전치증폭기는 일렛트렛 마이크로부터 싱글엔드 형태로 입력 받은 신호를 증폭한 후, 차동신호의 형태로 ADC에 전달한다. 또, 3.6, 7.2, 14.4, 28.8의 가변이득을 가지며 100Hz~10kHz의 주파수 대역에서 동작한다. 설계된 증폭기는 130nm CMOS 공정으로 제작되었으며, 1.2V 전원을 사용하여 측정한 결과 85dB의 SNR, 0.05%의 고조파 왜곡 및 $200{\mu}W$의 파워소모를 얻었다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1996년도 춘계학술대회
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• pp.240-242
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• 1996

In this paper, we proposed a method of a hearing aid suitable for the sensorineural hearing impaired. Generally as the sensorineural hearing impaired have narrow audible ranges between threshold and discomfortable level, the speech spectrum may easily go beyond their audible range. Therefore speech spectrum must be optimally amplified and compressed into the impaired's audible range. The level and frequency of input speech signal are varied continuously. So we have to make compensation input signal for frequency-gain loss of the impaired, specially in the frequency band which includes much information. The input sigaal is divided into short time block and spectrum within the block is calculated. The frequency-gain characteristic is determined using the calculated spectrum. The number of frequency band and the target gain which will be added input signal are estimated. The input signal within the block is processed by a single digital filter with the calculated frequency-gain characteristics. From the results of monosyllabic speech tests to evaluate the performance of the proposed algorithm, the scores of test were improved.

• 재활복지공학회논문지
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• 제11권1호
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• pp.63-71
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• 2017

본 논문에서는 달팽이관의 정원창 이식용으로 최근 새롭게 제안된 3코일 벨로우즈형 진동체(tri-coil bellows transducer, TCBT)를 이용하는 반이식형 인공중이(semi-implantable middle ear hearing device)를 위한 신호처리회로를 설계하였다. 설계된 반이식형 인공중이는 높은 효율을 가지는 유도결합 방법을 이용하여 귀 뒤편에 착용되는 체외기와 대응되는 피부 내측에 위치하는 체내기 간에 데이터를 전송한다. 귀 뒤 부위의 피부두께를 포함하는 반이식형 인공중이의 송수신 거리를 고려하여 송수신 코일과 신호처리 회로를 설계 및 구현하였다. 또한 데이터 전송 효율을 높이기 위하여, 전력을 충분히 증폭하기 위한 체외기의 출력부도 설계 하였다. 유도결합 방식을 이용한 반이식형 인공중이의 동작을 확인하기 위하여, PSpice를 이용하여 회로해석을 수행하였으며, 활용 가능한 크기의 신호처리 보드를 제작하여 그 성능을 검증하였다.

• Journal of Audiology & Otology
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• 제24권4호
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• pp.180-190
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• 2020

Background and Objectives: Although many studies have evaluated the effect of the digital noise reduction (DNR) algorithm of hearing aids (HAs) on speech recognition, there are few studies on the effect of DNR on music perception. Therefore, we aimed to evaluate the effect of DNR on music, in addition to speech perception, using objective and subjective measurements. Subjects and Methods: Sixteen HA users participated in this study (58.00±10.44 years; 3 males and 13 females). The objective assessment of speech and music perception was based on the Korean version of the Clinical Assessment of Music Perception test and word and sentence recognition scores. Meanwhile, for the subjective assessment, the quality rating of speech and music as well as self-reported HA benefits were evaluated. Results: There was no improvement conferred with DNR of HAs on the objective assessment tests of speech and music perception. The pitch discrimination at 262 Hz in the DNR-off condition was better than that in the unaided condition (p=0.024); however, the unaided condition and the DNR-on conditions did not differ. In the Korean music background questionnaire, responses regarding ease of communication were better in the DNR-on condition than in the DNR-off condition (p=0.029). Conclusions: Speech and music perception or sound quality did not improve with the activation of DNR. However, DNR positively influenced the listener's subjective listening comfort. The DNR-off condition in HAs may be beneficial for pitch discrimination at some frequencies.

• 대한청각학회지
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• 제24권4호
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• pp.180-190
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• 2020

Background and Objectives: Although many studies have evaluated the effect of the digital noise reduction (DNR) algorithm of hearing aids (HAs) on speech recognition, there are few studies on the effect of DNR on music perception. Therefore, we aimed to evaluate the effect of DNR on music, in addition to speech perception, using objective and subjective measurements. Subjects and Methods: Sixteen HA users participated in this study (58.00±10.44 years; 3 males and 13 females). The objective assessment of speech and music perception was based on the Korean version of the Clinical Assessment of Music Perception test and word and sentence recognition scores. Meanwhile, for the subjective assessment, the quality rating of speech and music as well as self-reported HA benefits were evaluated. Results: There was no improvement conferred with DNR of HAs on the objective assessment tests of speech and music perception. The pitch discrimination at 262 Hz in the DNR-off condition was better than that in the unaided condition (p=0.024); however, the unaided condition and the DNR-on conditions did not differ. In the Korean music background questionnaire, responses regarding ease of communication were better in the DNR-on condition than in the DNR-off condition (p=0.029). Conclusions: Speech and music perception or sound quality did not improve with the activation of DNR. However, DNR positively influenced the listener's subjective listening comfort. The DNR-off condition in HAs may be beneficial for pitch discrimination at some frequencies.